Hidden section not hidden on the new theme

[Etheryte]

Part of https://github.com/SUSE/spacewalk/issues/18940

All urls below are specified as the dev proxy (yarn proxy https://...), since that's the most convenient way to work on these issues.

To switch between the new theme and the old theme in the console: debugUtils.toggleUpdatedTheme()
To switch between the Suma theme and the Uyuni theme: debugUtils.toggleTheme()

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https://localhost:8080/rhn/admin/config/GeneralConfig.do

The last option should be hidden, but is not on the new theme.

Old theme:

New theme:

Definition of done

The updated theme has no visual bugs, all related page urls are added to ViewHelper.java and view-helper.ts.